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 300 million years ago

Mean atmospheric O2
 163% of modern level

Mean atmospheric CO2
 3x pre-industrial level

Mean temperature
 Same as modern level


Paleozoic Earth - Early Conifers and Cordaitales dominate the foggy lowlands of southeastern Illinois 300 million years ago; Late Carboniferous; Pennsylvanian; Pinophyta; Cordaites - Natural History Illustration Geologic Time Scale

 Era: Paleozoic
  Period: Carboniferous*
   Epoch: Late
    Age: Gzhelian


Conifers and Cordaitales

Late Carboniferous conifers make an appearance 300 million years ago in what is today southeastern Illinois.

Fossil evidence suggests that these early conifers resembled today's Norfolk Island Pine. In this image the foreground trees illustrate three different stages of conifer growth, while in the (foggy) background are mature conifers along with towering woody plants of the order Cordaitales. The middle foreground conifer is about 30 feet tall. The undergrowth beneath the trees represents different varieties of fern.

*AKA Carboniferous/ Pennsylvanian


Copyright Walter B. Myers. All rights reserved.

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